Multi-stage filter



FIG. 1 is a front isometric perspective view of an embodiment of themulti-stage filter showing my new design;

FIG. 2 is a back isometric perspective view thereof;

FIG. 3 is a front profile view thereof;

FIG. 4 is a back profile view thereof;

FIG. 5 is a section view thereof, viewed along the line FIG. 5-FIG. 5 asshown in FIG. 3; and,

FIG. 6 is a top plan view thereof.

CLAIM The ornamental design for a multi-stage filter, as shown anddescribed.